It is recommended to visit the official Autodesk website or authorized resellers to download Revit Architecture 2015 libraries.
You can use this program to access AutoCAD Civil 3D drawing files.
The Graphisoft ArchiCAD Connection is a an add-in for Autodesk Revit programs.
It makes it possible to export and import your model from Revit to Sigma.
It is recommended to visit the official Autodesk website or authorized resellers to download Revit Architecture 2015 libraries.